package day07;

import org.omg.CORBA.FREE_MEM;

import java.util.Random;

public class VerifcationCode01 {
    public static void main(String[] args) {

        String code = generateVerCode(5);
        System.out.print("验证码为："+code);
    }




    public static String generateVerCode(int len){
        String code = "";
        char []  chs = {'a','b','c','d','e','f','g','h','i','j','k','l',
                'm','n','o','p','q','r','s','t','u','v','w','x','y','z','A'
                ,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T',
                'U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'
        };
        Random rand = new Random();
        for (int i= 1;i<=len;i++ ){//len次数
            int index = rand.nextInt(chs.length);//随机下标（0到61的）
            //int index = (int) (Math.random()*chs.length);
            code += chs[index];
        }

        return code;
    }
}
